[01] Hesam Rezaei, Department of Petroleum Engineering, Fars Science and Research Branch, Islamic Azad University, Marvdasht, Iran and Department of Petroleum Engineering, Marvdasht Branch, Islamic Azad University, Marvdasht, Iran. [02] Daryoush Emadzadeh, Department of Chemical Engineering, Gachsaran Branch, Islamic Azad University, Gachsaran, Iran.

Application of mixture of nano coagulant plus auxiliary mineral and polymeric coagulant in treatment of drilling wastewater is investigated in this experimental work. The effect of amount of nano zinc oxide as a main coagulant, addition of three commercial coagulants (ferric sulfate, ferric chloride and aluminum sulfate) and poly acryl amide and pH of feed on characteristics of drilling waste water is studied experimentally. In other words, the coagulation and flocculation is considered as chemical mechanism of treatment for wastewater of drilling in this study. The effect of zinc oxide nano coagulant besides sodium hydroxide and sodium carbonate is investigated. Also, the effect of application of mixture of coagulants which contains ferric chloride, ferric sulfate, aluminum sulfate and poly acryl amide as additives is investigated. The pH of feed wastewater is important in chemical treatment mechanism. Results show, The increase in the amount of nano zinc oxide doesn’t show the fixed trend in changes of pH value of treated wastewater. Usage of 0.5 gr/lit of zinc oxide nano coagulant shows decreasing trend in pH value till 21 hr and after that time period the value of pH increases. Application of 1 gr/lit of nano zinc oxide increases the pH value after 25 hr.

Polyacrylamide, Oily Compounds, Treatment Unit, Drilling Wastewater, Coagulant

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